Watts 0384342 Valve

The Watts 0384342 is a heavy-duty boiler pressure relief valve, also identified as the Model 740-2-60, engineered for large-scale hydronic heating systems. Maintaining ASME Section IV compliance, this valve features a 2-inch NPT inlet and an expanded 2.5-inch NPT outlet to handle massive discharge volumes. With a factory set point of 60 PSI and a certified relief capacity of 8,875,000 BTU/hr, it provides critical overpressure protection for high-output hot water space heating boilers. The rugged iron body construction is complemented by a non-metallic disc-to-metal seat and a stainless steel spring to prevent sticking and ensure reliable reseating after operation. Designed strictly for emergency safety rather than operating control, it utilizes a raised seat to keep sediment from fouling the seal, ensuring long-term seat tightness in demanding HVACR environments.

• High Discharge Capacity: Certified 8,875,000 BTU rating ensures safety for high-capacity industrial and commercial boiler systems.
• Anti-Foul Design: The expanded outlet drain and raised seat prevent water trapping and sediment accumulation around the valve seat.
• Corrosion Resistance: Equipped with a stainless steel spring and stick-resistant non-metallic disc for consistent performance in harsh water conditions.
• Field Verification: Includes a manual test lever for essential annual inspections and waterway clearance checks.

Is the Watts 0384342 suitable for steam applications?
No, this valve is specifically designed for hot water space heating boilers. For steam service, an ASME Section I or VIII rated safety valve must be selected based on steam discharge requirements.

Why are the inlet and outlet sizes different?
The expanded outlet (2.5 inches) is larger than the inlet (2 inches) to facilitate the rapid discharge of high-volume water or flashed steam without creating excessive backpressure that could hinder valve performance.

What is the maximum operating temperature for this relief valve?
The Watts 740 series is rated for a maximum temperature of 250°F (121°C), making it compatible with most high-temp residential and commercial heating loops.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.